Add @access and @usage support for named union

.chronus/changes/fix-tcgc-2024-2-13-14-25-56.md

@@ -0,0 +1,7 @@
+---
+changeKind: feature
+packages:
+  - "@azure-tools/typespec-client-generator-core"
+---
+
+Add `@access` and `@usage` support for named union

docs/libraries/typespec-client-generator-core/reference/decorators.md

@@ -28,7 +28,7 @@ the access result is undefined.
 
 #### Target
 
-`Model | Operation | Enum`
+`Model | Operation | Enum | Union`
 
 #### Parameters
 
@@ -201,6 +201,8 @@ interface MyInterface {}
 
 ### `@clientFormat` {#@Azure.ClientGenerator.Core.clientFormat}
 
+DEPRECATED: Use `@encode` decorator in `@typespec/compiler` instead.
+
 Can be used to explain the client type that the current TYPESPEC
 type should map to.
 
@@ -289,6 +291,8 @@ op test: void;
 
 ### `@exclude` {#@Azure.ClientGenerator.Core.exclude}
 
+DEPRECATED: Use `@usage` and `@access` decorator instead.
+
 Whether to exclude a model from generation for specific languages. By default we generate
 all models that are included in operations.
 
@@ -345,6 +349,8 @@ model Bar {}
 
 ### `@include` {#@Azure.ClientGenerator.Core.include}
 
+DEPRECATED: Use `@usage` and `@access` decorator instead.
+
 Whether to include a model in generation for specific languages. By default we generate
 all models that are included in operations.
 
@@ -373,6 +379,8 @@ model ModelToInclude {
 
 ### `@internal` {#@Azure.ClientGenerator.Core.internal}
 
+DEPRECATED: Use `@access` decorator instead.
+
 Whether to mark an operation as internal for specific languages,
 meaning it should not be exposed to end SDK users
 
@@ -469,7 +477,7 @@ you need to take care of all related models/enums.
 
 #### Target
 
-`Model | Enum`
+`Model | Enum | Union`
 
 #### Parameters
 

packages/typespec-client-generator-core/README.md

@@ -45,7 +45,7 @@ the access result is undefined.
 
 ##### Target
 
-`Model | Operation | Enum`
+`Model | Operation | Enum | Union`
 
 ##### Parameters
 
@@ -218,6 +218,8 @@ interface MyInterface {}
 
 #### `@clientFormat`
 
+DEPRECATED: Use `@encode` decorator in `@typespec/compiler` instead.
+
 Can be used to explain the client type that the current TYPESPEC
 type should map to.
 
@@ -306,6 +308,8 @@ op test: void;
 
 #### `@exclude`
 
+DEPRECATED: Use `@usage` and `@access` decorator instead.
+
 Whether to exclude a model from generation for specific languages. By default we generate
 all models that are included in operations.
 
@@ -362,6 +366,8 @@ model Bar {}
 
 #### `@include`
 
+DEPRECATED: Use `@usage` and `@access` decorator instead.
+
 Whether to include a model in generation for specific languages. By default we generate
 all models that are included in operations.
 
@@ -390,6 +396,8 @@ model ModelToInclude {
 
 #### `@internal`
 
+DEPRECATED: Use `@access` decorator instead.
+
 Whether to mark an operation as internal for specific languages,
 meaning it should not be exposed to end SDK users
 
@@ -486,7 +494,7 @@ you need to take care of all related models/enums.
 
 ##### Target
 
-`Model | Enum`
+`Model | Enum | Union`
 
 ##### Parameters
 

packages/typespec-client-generator-core/lib/decorators.tsp

@@ -92,6 +92,8 @@ extern dec client(target: Namespace | Interface, value?: {}, scope?: valueof str
 extern dec operationGroup(target: Namespace | Interface, scope?: valueof string);
 
 /**
+ * DEPRECATED: Use `@usage` and `@access` decorator instead.
+ *
  * Whether to exclude a model from generation for specific languages. By default we generate
  * all models that are included in operations.
  * @param scope The language scope you want this decorator to apply to. If not specified, will apply to all language emitters
@@ -108,6 +110,8 @@ extern dec operationGroup(target: Namespace | Interface, scope?: valueof string)
 extern dec exclude(target: Model, scope?: valueof string);
 
 /**
+ * DEPRECATED: Use `@usage` and `@access` decorator instead.
+ *
  * Whether to include a model in generation for specific languages. By default we generate
  * all models that are included in operations.
  * @param scope The language scope you want this decorator to apply to. If not specified, will apply to all language emitters
@@ -126,6 +130,8 @@ extern dec include(target: Model, scope?: valueof string);
 alias ClientFormat = "unixtime" | "iso8601" | "rfc1123" | "seconds";
 
 /**
+ * DEPRECATED: Use `@encode` decorator in `@typespec/compiler` instead.
+ *
  * Can be used to explain the client type that the current TYPESPEC
  * type should map to.
  * @param value The client format to apply.
@@ -137,10 +143,12 @@ alias ClientFormat = "unixtime" | "iso8601" | "rfc1123" | "seconds";
  * }
  * ```
  */
-#deprecated "@clientFormat decorator is deprecated. Use `@encode` decorator in `@typespec/core` instead."
+#deprecated "@clientFormat decorator is deprecated. Use `@encode` decorator in `@typespec/compiler` instead."
 extern dec clientFormat(target: ModelProperty, value: valueof ClientFormat);
 
 /**
+ * DEPRECATED: Use `@access` decorator instead.
+ *
  * Whether to mark an operation as internal for specific languages,
  * meaning it should not be exposed to end SDK users
  * @param scope The language scope you want this decorator to apply to. If not specified, will apply to all language emitters
@@ -233,7 +241,7 @@ enum Usage {
  * op getModel(): Fish;
  * ```
  */
-extern dec usage(target: Model | Enum, value: EnumMember | Union, scope?: valueof string);
+extern dec usage(target: Model | Enum | Union, value: EnumMember | Union, scope?: valueof string);
 
 /**
  * Access value.
@@ -389,7 +397,11 @@ enum Access {
  * ): void;
  * ```
  */
-extern dec access(target: Model | Operation | Enum, value: EnumMember, scope?: valueof string);
+extern dec access(
+  target: Model | Operation | Enum | Union,
+  value: EnumMember,
+  scope?: valueof string
+);
 
 /**
  * Set whether a model property should be flattened or not.

packages/typespec-client-generator-core/src/decorators.ts

@@ -41,7 +41,7 @@ import { TCGCContext, parseEmitterName } from "./internal-utils.js";
 import { createStateSymbol, reportDiagnostic } from "./lib.js";
 import { experimental_getSdkPackage } from "./package.js";
 import { getLibraryName } from "./public-utils.js";
-import { getSdkEnum, getSdkModel } from "./types.js";
+import { getSdkEnum, getSdkModel, getSdkUnion } from "./types.js";
 
 export const namespace = "Azure.ClientGenerator.Core";
 const AllScopes = Symbol.for("@azure-core/typespec-client-generator-core/all-scopes");
@@ -697,7 +697,7 @@ const usageKey = createStateSymbol("usage");
 
 export function $usage(
   context: DecoratorContext,
-  entity: Model | Enum,
+  entity: Model | Enum | Union,
   value: EnumMember | Union,
   scope?: LanguageScopes
 ) {
@@ -735,7 +735,7 @@ export function $usage(
 
 export function getUsageOverride(
   context: TCGCContext,
-  entity: Model | Enum
+  entity: Model | Enum | Union
 ): UsageFlags | undefined {
   return getScopedDecoratorData(context, usageKey, entity);
 }
@@ -750,7 +750,7 @@ const accessKey = createStateSymbol("access");
 
 export function $access(
   context: DecoratorContext,
-  entity: Model | Enum | Operation,
+  entity: Model | Enum | Operation | Union,
   value: EnumMember,
   scope?: LanguageScopes
 ) {
@@ -766,23 +766,32 @@ export function $access(
 
 export function getAccessOverride(
   context: TCGCContext,
-  entity: Model | Enum | Operation
+  entity: Model | Enum | Operation | Union
 ): AccessFlags | undefined {
   return getScopedDecoratorData(context, accessKey, entity);
 }
 
 export function getAccess(
   context: TCGCContext,
-  entity: Model | Enum | Operation
+  entity: Model | Enum | Operation | Union
 ): AccessFlags | undefined {
   const override = getScopedDecoratorData(context, accessKey, entity);
   if (override || entity.kind === "Operation") {
     return override;
   }
 
-  return entity.kind === "Model"
-    ? getSdkModel(context, entity).access
-    : getSdkEnum(context, entity).access;
+  switch (entity.kind) {
+    case "Model":
+      return getSdkModel(context, entity).access;
+    case "Enum":
+      return getSdkEnum(context, entity).access;
+    case "Union":
+      const type = getSdkUnion(context, entity);
+      if (type.kind === "enum" || type.kind === "model") {
+        return type.access;
+      }
+      return undefined;
+  }
 }
 
 const flattenPropertyKey = createStateSymbol("flattenPropertyKey");

packages/typespec-client-generator-core/src/types.ts

@@ -351,6 +351,7 @@ export function getSdkUnionWithDiagnostics(
       getClientTypeWithDiagnostics(context, nonNullOptions[0], operation)
     );
     clientType.nullable = true;
+    clientType.__raw = type;
     return diagnostics.wrap(clientType);
   }
 
@@ -1309,7 +1310,7 @@ function updateAccessOfModel(context: TCGCContext): void {
       continue;
     }
 
-    const accessOverride = getAccessOverride(context, type as any);
+    const accessOverride = getAccessOverride(context, sdkType.__raw as any);
     if (accessOverride) {
       sdkType.access = accessOverride;
       continue;

packages/typespec-client-generator-core/test/types.test.ts

@@ -658,6 +658,90 @@ describe("typespec-client-generator-core: types", () => {
         }
       }
     });
+
+    it("usage", async function () {
+      await runner.compileWithBuiltInService(`
+      union UnionAsEnum {
+        "A",
+        "B",
+        string,
+      }
+
+      model Foo {
+        prop: string;
+      }
+
+      union NullableUnion {
+        Foo,
+        null
+      }
+
+      model Bar {
+        prop1: UnionAsEnum;
+        prop2: NullableUnion;
+      }
+
+      @access(Access.internal)
+      op func(
+        @body body: Bar
+      ): void;
+      `);
+
+      const models = runner.context.experimental_sdkPackage.models;
+      strictEqual(models.length, 2);
+      const foo = models.find((x) => x.name === "Foo")! as SdkModelType;
+      strictEqual(foo.usage, UsageFlags.Input);
+      strictEqual(foo.access, "internal");
+      const enums = runner.context.experimental_sdkPackage.enums;
+      strictEqual(enums.length, 1);
+      const unionAsEnum = enums.find((x) => x.name === "UnionAsEnum")! as SdkEnumType;
+      strictEqual(unionAsEnum.usage, UsageFlags.Input);
+      strictEqual(unionAsEnum.access, "internal");
+    });
+
+    it("usage override", async function () {
+      await runner.compileWithBuiltInService(`
+      @usage(Usage.input | Usage.output)
+      @access(Access.public)
+      union UnionAsEnum {
+        "A",
+        "B",
+        string,
+      }
+
+      model Foo {
+        prop: string;
+      }
+
+      @usage(Usage.input | Usage.output)
+      @access(Access.public)
+      union NullableUnion {
+        Foo,
+        null
+      }
+
+      model Bar {
+        prop1: UnionAsEnum;
+        prop2: NullableUnion;
+      }
+
+      @access(Access.internal)
+      op func(
+        @body body: Bar
+      ): void;
+      `);
+
+      const models = runner.context.experimental_sdkPackage.models;
+      strictEqual(models.length, 2);
+      const foo = models.find((x) => x.name === "Foo")! as SdkModelType;
+      strictEqual(foo.usage, UsageFlags.Input | UsageFlags.Output);
+      strictEqual(foo.access, "public");
+      const enums = runner.context.experimental_sdkPackage.enums;
+      strictEqual(enums.length, 1);
+      const unionAsEnum = enums.find((x) => x.name === "UnionAsEnum")! as SdkEnumType;
+      strictEqual(unionAsEnum.usage, UsageFlags.Input | UsageFlags.Output);
+      strictEqual(unionAsEnum.access, "public");
+    });
   });
   describe("SdkEnumType", () => {
     it("string extensible", async function () {